| 1 |
The same retarding force is applied to stop a train. The train stops after 80 m. If the speed is doubled, then the
Stopping distance will be: |
The same
Doubled
Halved
Four times
|
| 2 |
A man pushes a wall and fails to displace it. He does: |
Negative work
Positive but not maximum work
No work at all
Maximum work
|
| 3 |
A body is dropped from a height of 20 m and rebounds to a height of 10 m. the loss of energy is: |
10%
45%
50%
75%
|
| 4 |
The gravity does no work, when the body moves: |
Horizontally
Vertically upwards
Vertically downward
At an angle of 45o with horizontal
|
| 5 |
A person weighing 20 mg walks on a level platform with a speed of 2 ms-1
. The work by the person against the
force of gravity is: |
Zero
2J
60J
600J
|
| 6 |
Ratio of dimension of K.E and power is: |
1:1
T:1
1:T
M:J
|
| 7 |
A body of mass 3 Kg lies on the surface on the table 2m high. It is moved on the surface by 4m. The change of
P.E will be: |
Zero
9.8 J
19.6 J
329 J
|
| 8 |
Which of the following types of force can do no work on the particle on which it acts? |
Frictional force
Gravitational force
Elastic force
Centripetal force
|
| 9 |
The momentum of a particle is numerically equal to its K.E. What is the velocity of a particle? |
9 ms<sup>-1</sup>
3 ms<sup>-1</sup>
2 ms-1
1 ms<sup>-1</sup>
|
| 10 |
When the velocity of a body is doubled: |
Its K.E is doubled
Its P.E is doubled
Its momentum is doubled
Its acceleration is doubled
|
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